More experiments with 3D

MoKaLux · December 2020

wouaw, that looks so much better now, thank you for the explanations

MoKaLux · December 2020

monsieur hgy29

I can see in both your videos that you have shadows for all your objects in the world at once. Why doesn't it work for me? Is it due to the size of the world? My world is 512*512 pixels.

Everytime I pass a certain limit the shadow disappears.

I would like to position the light somewhere up in the sky (a sun) and see all the shadows of my objects

What am I missing?

I have updated my GH https://github.com/mokalux/gideros-3D-FP

hgy29 · December 2020

Actually I don’t, my shadows are only visible on a certain area. In the first version the area was big, but the shadows not very smooth. In the latest versions, I move the shadow area with the player, so that shadows are visible for objects nearby the player

MoKaLux · December 2020

thank you I will try to increase the area around the player

hgy29 · December 2020

Todays progress:
- First world (I'd like to propose at least three worlds) elements are done. Still perfectible in many ways but already something.
- Made a short world entry scene, basically a camera flight and a mission explanation dialogue (shortened in the video).
- Tractor beam and item lifting/releasing works (not shown on the video)
- I am progressing really slowly currently, having hard time building the scenery. The game story is taking form though, and the hardest part is yet to come.

MoKaLux · December 2020

I have a question please

Is it possible to render the animation in a render target? I don't know what the source should be the camera? the scene? or the mesh?
I tried playing with scaling and everything but could not get a proper render, it looks like the mesh is rotated somehow.
~~Could you help me please? I have a big IDEA in mind but I am stuck~~
SOLVED: if you want to capture your model you can do:

local camera = D3.View.new(width, height, 45, 0.1, 32)
local rt = RenderTarget.new(256, 256)
local bmprt = Bitmap.new(rt)
self:addChild(bmprt)
rt:draw(camera.view)

MoKaLux · December 2020

I have a question please

I can get the width and the height of a 3d mesh

-- the model
local xfile = "3d_anims/walking.json"
local model = buildGdx(xfile, {} )
print("MODEL SIZE", model:getWidth(), model:getHeight())

How do I get its length (on the z axis, I don't know what it's called)? From G3DFormat.lua I can see:

function G3DFormat.computeG3DSizes(g3d)
...
elseif g3d.type=="mesh" then
	local minx,miny,minz=100000,100000,100000
	local maxx,maxy,maxz=-100000,-100000,-100000
	for id=1,#g3d.indices do
		local i=g3d.indices[id]*3-2
		local x,y,z=g3d.vertices[i],g3d.vertices[i+1],g3d.vertices[i+2]
		minx=math.min(minx,x)
		miny=math.min(miny,y)
		minz=math.min(minz,z)
		maxx=math.max(maxx,x)
		maxy=math.max(maxy,y)
		maxz=math.max(maxz,z)
	end
...
if m then
	g3d.min[1],g3d.min[2],g3d.min[3] = m:transformPoint(g3d.min[1],g3d.min[2],g3d.min[3])
	g3d.max[1],g3d.max[2],g3d.max[3] = m:transformPoint(g3d.max[1],g3d.max[2],g3d.max[3])
end
end

Thank you
I don't want to "pollute" this topic so I add my thank you here for the below answer by hgy29.

hgy29 · December 2020

To get the depth, you can do model.max[3]-model.min[3]

MoKaLux · December 2020

~~one more question please~~
Is it possible to set an ortographic projection? I don't know what to pass as arguments

D3View=Core.class(Sprite)
function D3View:init(sw,sh,fov,near,far)
	self.view=Viewport.new()
	self.projection=Matrix.new()
	self.fov=fov or 45
	self.near=near or 0.1
	self.far=far or 1000
	self:setSize(sw or 1, sh or 1)
	self.scene=Sprite.new()
	self.view:setContent(self.scene)
	self:addChild(self.view)	
end
 
function D3View:setSize(w,h)
	self.sw=w
	self.sh=h
--	self.projection:perspectiveProjection(self.fov,self.sw/self.sh,self.near,self.far)
--	self.projection:orthographicProjection(-self.sw/2, self.sw/2, -self.sh/2, self.sh/2, self.near, self.far)
	self.projection:orthographicProjection(0, self.sw, 0, self.sh, self.near, self.far)
	self.view:setProjection(self.projection)
	self.view:setPosition(self.sw/2,self.sh/2)
	self.view:setScale(-self.sw/2,-self.sh/2,1)
end

Sorry for all the questions.

EDIT: this works

function D3View:setSize(w,h)
	self.sw=w
	self.sh=h
--	self.projection:perspectiveProjection(self.fov,self.sw/self.sh,self.near,self.far)
	local xx = 2.5
	self.projection:orthographicProjection(-xx,xx,-xx,xx,self.near,self.far)
	self.view:setProjection(self.projection)
	self.view:setPosition(self.sw/2,self.sh/2)
	self.view:setScale(-self.sw/2,-self.sh/2,1)
end

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